Create a Virtual Webcam for your Syphon Client with CamTwist


CamTwist is a FREE broadcast quality TV studio app for Mac. It allows for various effects to be applied to a video source. It then acts as a virtual webcam for other Mac apps to use (e.g. Skype, LiveStream, ProPresenter)


Download CamTwist 3.0

The 3.0 Beta comes with native Syphon support, when using the 2.5 version, you will need CamTwist Syphon ().

Download CamTwist 3.0

Install CamTwist 3.0

Install Camtwist

Install CamTwist 3.0


Start a video stream from you favorite application to Syphon, or use your Canon DSLR as a live input using one of these apps (Camera Live or Canon2Syphon.


Open CamTwist

Choose Syphon as your input video source and under Settings select your Syphon Client (I’m using VDMX5 with Syphon Output in this example).

Open CamTwist

Open the app you want to use the Syphon feed as a Webcam

I will use Skype in this example. Under Settings I will find a list of my webcam sources. CamTwist is one of them.

Open the app you want to use the Syphon feed as a Webcam

Happy Streaming!


Create a simple audio-reactive visual with Quartz Composer and VDMX

This Tutorial will give you a glimpse into the audio-reactive possibilities of Quartz Composer patches in VDMX.

Create a simple kaleidoscope effect in Quartz Composer

If you don’t have Quartz Composer, this tutorial can help you get set up.

  1. Open Quartz Composer and create a Basic Composition
  2. Drag an image or video file into the composition
     Drag in an image or video fileInitial output view
  3. Drag in a Billboard patch from the Patch Library.
    In the Patch Inspector adjust the Width value to 2 (making it full width in the Quartz Composer coordinate system)
    Change the Pixel Aligned value to 1 to ensure pixel aligned output.
    Add a billboard patch and adjust the width and pixel aligned values
  4. Delete the Layer patch connected to the image input and drag in a Kaleidoscope patch from the Patch Library.
    Connect the image output to the Kaleidoscope image input and the Kaleidoscope image output to the Billboard image input.
    In the Viewer you will see the effect applied.
    Added the Kaleidoscope effect

Adjust the patch to take video input from VDMX

Quartz Composer allows you to publish inputs so they can receive values or data from other software. In this case we want to control the kaleidoscope count and angle and apply the effect to a video clip from VDMX. In order to do that we will insert input splitters for each of the effect values and will publish their inputs.

  1. Right-click on the Kaleidoscope patch and select “Insert Input Splitter > Angle”
     insert an input splitter for the angle value
  2. Select the input splitter “Angle” and hit ⌘+I to open the patch inspector. 
    Under “Settings” select Type: “Number” and set the minimal and maximal values to -90 and 90 respectively.
    set up the values in the patch inspector
  3. Right-click on the input splitter input and select “Publish Inputs > Input”
    Rename the input to “Angle”
     publish the input
    Published inputs appear green.
    published inputs appear green
  4. Repeat the same procedure for the “count” and “image” values
  5. Set the “count” settings to “Number” with minimal and maximal values of 6 and 40
    count settings
  6. Set the “image” settings to “Image”
  7. Delete the original image input we dragged in.
    published image input
  8. Save your composition as a patch “Kaleidoscope patch.qtz”.

Screen recording of the previous steps 

KaleidoscopeTutorial 01 QuartzComposer from Tobias Treppmann on Vimeo.

Add the patch to VDMX’s Effects Library

  1. In Finder locate the file you just saved and copy it to the clipboard.
  2. Hit ⇧⌘G to open the “Go To Folder” dialog and navigate to “~/Library/Application Support/VDMX/qcFX/“
  3. Paste the file into the qcFX folder.

Load the patch into VDMX

  1. Start VDMX and play a video clip. 
  2. In the Workspace Inspector under “Layers” select “Layer 1” and under “Layer 1 Composition” set the Sizing Mode to “Fill”.
  3. Under Layer FX select “Load Asset > Misc. QC > Kaleidoscope patch.qtz”.
     Select the patch as a layer effect
  4. See the effect applied and notice the Count and Angle controls.
     Our quartz patch applied 

Screen Recording of the previous steps

KaleidoscopeTutorial 03 VDMX setup from Tobias Treppmann on Vimeo.

Let the music play

  1. create a second layer in VDMX and call it “Audio”
  2. Add a Media Bin ⌘B, assign it to the “Audio” layer and play the audio file
    Audio Layer
  3. In the Workspace Inspector’s  “Plugins” tab click the “+” button and select “Audio Analysis”
    Add Audio Analysis Plugin
  4. Click the Recycling Icon to activate the audio input.
    The Audio Analysis Plugin

Hook up the Audio Analysis to our effects

  1. Set the Filter 2 in the Audio Analysis plugin to a spot where it get’s some input, but not the main action or rhythm. 
  2. Right-click on the Angle control under Layer 1 FX and select “Use Data Source > Audio Analysis 1 > Filter 2″
    Use Data Sources
  3. Then adjust the input range to something that makes for a gentle effect.
    Adjusted Range
  4. Let’s support this effect by creating a continuous visual rhythm by moving Filter 3 in the Audio Analysis plugin to a spot where it captures the beat of the song. 
  5. Then assign “Audio Analysis 1 > Filter 3” as a Data Source for the Width and Height of Layer 1.
  6. Limit both ranges to 1.0 – 1.50 or something that feels good. 
    Visual Rhythm

Screen Recording (with Audio) of the previous steps and the final result

KaleidoscopeTutorial 04 VDMX AudioAnalysis from Tobias Treppmann on Vimeo.


Using Transparent Animated GIFs in VDMX

VDMX will play animated GIFs, but won’t render transparency in a GIF. If you want to use transparent GIFs in your setup, you need to convert them into a video file with an alpha channel.

For this tutorial you will need:

  • VDMX
  • Apple Motion

Find a GIF with transparency


Maybe a dog from

Giphy Dog

Split the GIF into its frames

You can do that exporting each frame manually in Photoshop, or labeling each layer with a file extension and exporting it using a tool like Slicy. Or you can go all Internet and use EZGIF’s Online Splitter Tool.

EZGIF Splitter

Once uploaded, hit “Split It”

Voila Capture2014 05 06 02 47 57 PM

Then “Download frames as ZIP”

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Import the frames into Apple Motion

Extract the files from the ZIP archive, select them all and drag them onto the canvas in Motion.

Voila Capture2014 05 06 03 15 56 PM


Motion has imported them as a grouped object that can be moved and resized easily.

Resize it to your needs

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Adjust the Play Range

Make sure to adjust the play range to the length of the GIF.

Voila Capture2014 05 06 03 41 23 PM

Voila Capture2014 05 06 03 41 32 PM

Export to ProRes 4444

Export as a movie (CMD+E) and select “Apple ProRes 4444” as the output format.

Selet “Use play range” under “Duration”

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Make sure that “Color: Color + Alpha” is selected under the “Render” tab.

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Continue the process and export the video.

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Convert to Hap Alpha

Open VVBatchExporter.


  1. Import the video.
  2. If you don’t have a Hap Alpha preset, yet, select “QuickTIme Movie” as the output format and click “Settings”. 
  3. Click “Settings” again
  4. Choose “Hap Alpha” as the Compression Type and click ok on all dialogs.

Voila Capture2014 05 06 03 49 49 PM

To create the preset click “New from settings” and name it “Hap Alpha”

Select the “Hap Alpha” setting under output format.

Configure any other aspects to your needs and click “Export!”

Use Converted Video in VDMX

transparent animated gif in vdmx from Tobias Treppmann on Vimeo.

Happy GIFing!


Using an iPad screen as live video input in VDMX

When using VDMX I’m always looking for new types of video input and live interaction. I love the idea of direct manipulation on the iPad and was looking for a way to broadcast that through VDMX. Follow the simple steps below to use your iPad in your own setup.

You will need:

  • VDMX5
    My real-time video performance or VJ software of choice.
  • AirServer
    AirServer is the most advanced AirPlay receiver. It allows you to receive AirPlay feeds, similar to an Apple TV, so you can stream content or Mirror your display from your iOS devices or Macs running Mountain Lion or Mavericks.
  • Syphon
    Syphon is an open source Mac OS X technology that allows applications to share frames – full frame rate video or stills – with one another in realtime.

Let’s get started

  1. Start VDMX and create a new project [⌘+N]VDMX-iPad
  2. Launch AirServer
  3. On your iPad, go to your AirPlay settings and select your AirServer server, usually named after your Macbook. Then select Mirroring. VDMX-iPad2
  4. Your iPad screen will appear in a window on your desktop. Make sure not to close this window, otherwise this won’t work.
  5. Start Syphon’s Simple Server and Simple Client.
  6. In the Simple Client select your iPad in the sources drop down.VDMX-iPad3
  7. In VDMX right-click in your media bin and select “Add Clips From Built-In Sources > Syphon > AirServer-YOUR IPAD NAME”VDMX-iPad4
  8. Make sure the clip is selected and highlighted in red.VDMX-iPad5
  9. Start using your iPad as a live input.

See it in action:

Using an iPad screen as live input in VDMX from Tobias Treppmann on Vimeo.